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I had this problem my self, but here is the solution.
The sansa is really picky about Movies first you need to make sure you have the right File, I've only been able to get AVI to play on the fuze second, go on to SanDisk's web page and get the Firmware update here http://forums.sandisk.com/sansa/board/message?board.id=sansafuse&message.id=210
There is also a converter that is offered by SanDisk that is rather handy.
hope this helped

Download the Sansa Recovery Tool from the Sansa website.
Format - Erases Everything: Connect your Sansa player to the computer and open Windows Media Player. Click on the Sync tab. Pull down the drop down menu underneath the Sync tab by moving your cursor over the Sync tab and left clicking on the little black arrow underneath the Sync tab. Highlight "Sansa 1GB" (wording may vary slightly), and then select "Format." - this should erase everything.
Firmware Upgrade- Erases Everything: Get the latest firmware upgrade from Sansa - it updates the firmware and erases every song in the player all at once. Note: this method doesn't work if already have the latest firmware. Go to this website and click "Firmware Updater" to find out: http://www.sandisk.com/Retail/DriverDownloads.aspx
-Tha Mp3 Doctor

Download the Sansa firmware upgrader and install it first. Then, hold in the volume + button on your Sansa player and connect the Sansa to your computer (while it is in the OFF position). The computer will recognize the player after you continue holding the volume + button for 5-50 seconds. Restart your computer. You will lose all files stored on the Sansa, but it will work again.